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Regular use of which of the following fertilizers increases the acidity of soil?

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Potassium nitrate

Urea

Superphosphate of lime

Ammonium sulphate

answer is D.

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Detailed Solution

The soil becomes more acidic when ammonium sulphate is used often.
Sulphuric acid is produced during the hydrolysis of ammonium sulphate, which raises the acidity of the soil.

${({NH}_{4})}_{2} {SO}_{4} \to 2 {NH}_{3} + H_{2} {SO}_{4}$

Slaked lime is applied to neutralise the acid in order to prevent acidity.

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